# urwid user interface for reportbug
#   Written by Chris Lawrence <lawrencc@debian.org>
#   (C) 2006-08 Chris Lawrence
#   Copyright (C) 2008-2016 Sandro Tosi <morph@debian.org>
#
# This program is freely distributable per the following license:
#
#  Permission to use, copy, modify, and distribute this software and its
#  documentation for any purpose and without fee is hereby granted,
#  provided that the above copyright notice appears in all copies and that
#  both that copyright notice and this permission notice appear in
# supporting documentation.
#
#  I DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL I
#  BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
#  DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
#  WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
#  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
#  SOFTWARE.
#
# Portions of this file are licensed under the Lesser GNU Public License
# (LGPL) Version 2.1 or later.  On Debian systems, this license is available
# in /usr/share/common-licenses/LGPL

import sys
import re
import getpass
from reportbug.exceptions import (
    UINotImportable,
    NoPackage, NoBugs, NoNetwork, NoReport,
)
from reportbug.urlutils import launch_browser
from text_ui import (
    ewrite,
    spawn_editor,
    system
)
from reportbug import VERSION

try:
    import urwid.raw_display
    import urwid
except ImportError:
    raise UINotImportable('Please install the python-urwid package to use this interface.')

ISATTY = sys.stdin.isatty()

log_message = ewrite


# Start a urwid session
def initialize_urwid_ui():
    ui = urwid.raw_display.Screen()
    ui.register_palette(palette)
    # Improve responsiveness of UI
    ui.set_input_timeouts(max_wait=0.1)
    return ui


# Empty function to satisfy ui.run_wrapper()
def nullfunc():
    pass


# Widgets ripped mercilessly from urwid examples (dialog.py)
class buttonpush(Exception):
    pass


def button_press(button):
    raise buttonpush(button.exitcode)


class SelectableText(urwid.Edit):
    def valid_char(self, ch):
        return False


class dialog(object):
    def __init__(self, message, body=None, width=None, height=None,
                 title='', long_message=''):
        self.body = body

        self.scrollmode = False
        if not body:
            if long_message:
                box = SelectableText(edit_text=long_message)
                box.set_edit_pos(0)
                self.body = body = urwid.ListBox([box])
                self.scrollmode = True
            else:
                self.body = body = urwid.Filler(urwid.Divider(), 'top')

        if not width:
            width = ('relative', 80)

        if not height:
            height = ('relative', 80)

        self.frame = urwid.Frame(body, focus_part='footer')
        if message:
            self.frame.header = urwid.Pile([urwid.Text(message),
                                            urwid.Divider()])

        w = self.frame
        # pad area around listbox
        w = urwid.Padding(w, ('fixed left', 2), ('fixed right', 2))
        w = urwid.Filler(w, ('fixed top', 1), ('fixed bottom', 1))
        w = urwid.AttrWrap(w, 'body')

        if title:
            w = urwid.Frame(w)
            w.header = urwid.Text(('title', title))

        # "shadow" effect
        w = urwid.Columns([w, ('fixed', 1, urwid.AttrWrap(urwid.Filler(urwid.Text(('border', ' ')), "top"), 'shadow'))])
        w = urwid.Frame(w, footer=urwid.AttrWrap(urwid.Text(('border', ' ')), 'shadow'))
        # outermost border area
        w = urwid.Padding(w, 'center', width)
        w = urwid.Filler(w, 'middle', height)
        w = urwid.AttrWrap(w, 'border')
        self.view = w

    def add_buttons(self, buttons, default=0, vertical=False):
        l = []
        for name, exitcode in buttons:
            if exitcode == '---':
                # Separator is just a text label
                b = urwid.Text(name)
                b = urwid.AttrWrap(b, 'scrolllabel')
            else:
                b = urwid.Button(name, self.button_press)
                b.exitcode = exitcode
                b = urwid.AttrWrap(b, 'selectable', 'focus')
            l.append(b)

        if vertical:
            box = urwid.ListBox(l)
            box.set_focus(default or 0)
            self.buttons = urwid.Frame(urwid.AttrWrap(box, 'selectable'))
            self.frame.footer = urwid.BoxAdapter(self.buttons, min(len(l), 10))
        else:
            self.buttons = urwid.GridFlow(l, 12, 3, 1, 'center')
            self.buttons.set_focus(default or 0)
            self.frame.footer = urwid.Pile([urwid.Divider(), self.buttons],
                                           focus_item=1)

    def button_press(self, button):
        raise buttonpush(button.exitcode)

    def run(self):
        # self.ui.set_mouse_tracking()
        size = self.ui.get_cols_rows()
        try:
            while True:
                canvas = self.view.render(size, focus=True)
                self.ui.draw_screen(size, canvas)
                keys = None
                while not keys:
                    keys = self.ui.get_input()
                for k in keys:
                    if urwid.util.is_mouse_event(k):
                        event, button, col, row = k
                        self.view.mouse_event(size,
                                              event, button, col, row,
                                              focus=True)
                    if k == 'window resize':
                        size = self.ui.get_cols_rows()
                    k = self.view.keypress(size, k)
                    if k:
                        self.unhandled_key(size, k)
        except buttonpush, e:
            return self.on_exit(e.args[0])

    def on_exit(self, exitcode):
        return exitcode

    def unhandled_key(self, size, k):
        if k in ('tab', 'shift tab'):
            focus = self.frame.focus_part
            if focus == 'footer':
                self.frame.set_focus('body')
            else:
                self.frame.set_focus('footer')

        if k in ('up', 'page up', 'down', 'page down'):
            if self.scrollmode:
                self.frame.set_focus('body')
                self.body.keypress(size, k)
            elif k in ('up', 'page up'):
                self.frame.set_focus('body')
            else:
                self.frame.set_focus('footer')

        if k == 'enter':
            # pass enter to the "ok" button
            self.frame.set_focus('footer')
            self.view.keypress(size, k)

    def main(self, ui=None):
        if ui:
            self.ui = ui
        else:
            self.ui = initialize_urwid_ui()
        return self.ui.run_wrapper(self.run)


class displaybox(dialog):
    def show(self, ui=None):
        if ui:
            self.ui = ui
        else:
            self.ui = initialize_urwid_ui()
        size = self.ui.get_cols_rows()
        canvas = self.view.render(size, focus=True)
        self.ui.start()
        self.ui.draw_screen(size, canvas)
        self.ui.stop()


class textentry(dialog):
    def __init__(self, text, width=None, height=None, multiline=False,
                 title='', edit_text=''):
        self.edit = urwid.Edit(edit_text=edit_text, multiline=multiline)
        body = urwid.ListBox([self.edit])
        body = urwid.AttrWrap(body, 'selectable', 'focustext')
        if not multiline:
            body = urwid.Pile([('fixed', 1, body), urwid.Divider()])
            body = urwid.Filler(body)

        dialog.__init__(self, text, body, width, height, title)

        self.frame.set_focus('body')

    def on_exit(self, exitcode):
        return exitcode, self.edit.get_edit_text()


class listdialog(dialog):
    def __init__(self, text, widgets, has_default=False, width=None,
                 height=None, title='', buttonwidth=12):
        l = []
        self.items = []
        for (w, label) in widgets:
            self.items.append(w)
            if label:
                w = urwid.Columns([('fixed', buttonwidth, w),
                                   urwid.Text(label)], 2)
            w = urwid.AttrWrap(w, 'selectable', 'focus')
            l.append(w)

        lb = urwid.ListBox(l)
        lb = urwid.AttrWrap(lb, "selectable")
        dialog.__init__(self, text, height=height, width=width, body=lb,
                        title=title)

        self.frame.set_focus('body')

    def on_exit(self, exitcode):
        """Print the tag of the item selected."""
        if exitcode:
            return exitcode, None

        for i in self.items:
            if hasattr(i, 'get_state') and i.get_state():
                return exitcode, i.get_label()
        return exitcode, None


class checklistdialog(listdialog):
    def on_exit(self, exitcode):
        """
        Mimick dialog(1)'s --checklist exit.
        Put each checked item in double quotes with a trailing space.
        """
        if exitcode:
            return exitcode, []

        l = []
        for i in self.items:
            if i.get_state():
                l.append(i.get_label())
        return exitcode, l


def display_message(message, *args, **kwargs):
    if args:
        message = message % tuple(args)

    if 'title' in kwargs:
        title = kwargs['title']
    else:
        title = ''

    if 'ui' in kwargs:
        ui = kwargs['ui']
    else:
        ui = None

    # Rewrap the message
    chunks = re.split('\n\n+', message)
    chunks = [re.sub(r'\s+', ' ', x).strip() for x in chunks]
    message = '\n\n'.join(chunks).strip()

    box = displaybox('', long_message=message, title=title or VERSION)
    box.show(ui)


def long_message(message, *args, **kwargs):
    if args:
        message = message % tuple(args)

    if 'title' in kwargs:
        title = kwargs['title']
    else:
        title = ''

    if 'ui' in kwargs:
        ui = kwargs['ui']
    else:
        ui = None

    # Rewrap the message
    chunks = re.split('\n\n+', message)
    chunks = [re.sub(r'\s+', ' ', x).strip() for x in chunks]
    message = '\n\n'.join(chunks).strip()

    box = dialog('', long_message=message, title=title or VERSION)
    box.add_buttons([("OK", 0)])
    box.main(ui)


final_message = long_message
display_report = long_message
display_failure = long_message


def select_options(msg, ok, help=None, allow_numbers=False, nowrap=False,
                   ui=None, title=None):
    box = dialog('', long_message=msg, height=('relative', 80),
                 title=title or VERSION)
    if not help:
        help = {}

    buttons = []
    default = None
    for i, option in enumerate(ok):
        if option.isupper():
            default = i
            option = option.lower()
        buttons.append((help.get(option, option), option))

    box.add_buttons(buttons, default, vertical=True)
    result = box.main(ui)
    return result


def yes_no(msg, yeshelp, nohelp, default=True, nowrap=False, ui=None):
    box = dialog('', long_message=msg + "?", title=VERSION)
    box.add_buttons([('Yes', True), ('No', False)], default=1 - int(default))
    result = box.main(ui)
    return result


def get_string(prompt, options=None, title=None, empty_ok=False, force_prompt=False,
               default='', ui=None):
    if title:
        title = '%s: %s' % (VERSION, title)
    else:
        title = VERSION

    box = textentry(prompt, title=title, edit_text=default)
    box.add_buttons([("OK", 0)])
    code, text = box.main(ui)
    return text or default


def get_multiline(prompt, options=None, title=None, force_prompt=False,
                  ui=None):
    if title:
        title = '%s: %s' % (VERSION, title)
    else:
        title = VERSION

    box = textentry(prompt, multiline=True)
    box.add_buttons([("OK", 0)])
    code, text = box.main(ui)
    l = text.split('\n')
    return l


def get_password(prompt=None):
    return getpass.getpass(prompt)


def menu(par, options, prompt, default=None, title=None, any_ok=False,
         order=None, extras=None, multiple=False, empty_ok=False, ui=None,
         oklabel='Ok', cancellabel='Cancel', quitlabel=None):
    if not extras:
        extras = []
    else:
        extras = list(extras)

    if not default:
        default = ''

    if title:
        title = '%s: %s' % (VERSION, title)
    else:
        title = VERSION

    if isinstance(options, dict):
        options = options.copy()
        # Convert to a list
        if order:
            olist = []
            for key in order:
                if key in options:
                    olist.append((key, options[key]))
                    del options[key]

            # Append anything out of order
            options = options.items()
            options.sort()
            for option in options:
                olist.append(option)
            options = olist
        else:
            options = options.items()
            options.sort()

    opts = []
    for option, desc in options:
        if desc:
            opts.append((option, re.sub(r'\s+', ' ', desc)))
        else:
            opts.append((option, desc))
    options = opts

    if multiple:
        widgets = [(urwid.CheckBox(option, state=(option == default)),
                    desc or '') for (option, desc) in options]
        box = checklistdialog(par, widgets, height=('relative', 80),
                              title=title)
        if quitlabel:
            box.add_buttons([(oklabel, 0), (cancellabel, -1),
                             (quitlabel, -2)])
        else:
            box.add_buttons([(oklabel, 0), (cancellabel, -1)])
        result, chosen = box.main(ui)
        if result < 0:
            # We return None to differentiate a Cancel/Quit from no selection, []
            return None
        return chosen

    # Single menu option only
    def label_button(option, desc):
        return option

    widgets = []
    rlist = []
    for option, desc in options:
        if option == '---':
            # Separator is just a text label
            b = urwid.Text(desc)
            b = urwid.AttrWrap(b, 'scrolllabel')
            desc = ''
        else:
            b = urwid.RadioButton(rlist, label_button(option, desc), state=(option == default))
            b.exitcode = option
            b = urwid.AttrWrap(b, 'selectable', 'focus')
        widgets.append((b, desc))

    box = listdialog(par, widgets, height=('relative', 80),
                     title=title, buttonwidth=12)
    if quitlabel:
        box.add_buttons([(oklabel, 0), (cancellabel, -1), (quitlabel, -2)])
    else:
        box.add_buttons([(oklabel, 0), (cancellabel, -1)])
    focus = 0
    if default:
        for i, opt in enumerate(options):
            if opt[0] == default:
                focus = i
                break

    result, chosen = box.main(ui)
    if result < 0:
        return result

    return chosen


# A real file dialog would be nice here
def get_filename(prompt, title=None, force_prompt=False, default=''):
    return get_string(prompt, title=title, force_prompt=force_prompt,
                      default=default)


def select_multiple(par, options, prompt, title=None, order=None, extras=None):
    return menu(par, options, prompt, title=title, order=order, extras=extras,
                multiple=True, empty_ok=False)


# Things that are very UI dependent go here
def show_report(number, system, mirrors,
                http_proxy, timeout, screen=None, queryonly=False, title='',
                archived='no', mbox_reader_cmd=None):
    from reportbug import debbugs

    ui = screen
    if not ui:
        ui = initialize_urwid_ui()

    sysinfo = debbugs.SYSTEMS[system]
    display_message('Retrieving report #%d from %s bug tracking system...',
                    number, sysinfo['name'], title=title, ui=ui)

    info = debbugs.get_report(number, timeout, system, mirrors=mirrors,
                              http_proxy=http_proxy, archived=archived)
    if not info:
        long_message('Bug report #%d not found.', number, title=title, ui=ui)
        return

    options = dict(o='Ok', d='More details (launch browser)',
                   m='Submit more information', q='Quit')
    valid = 'Odmq'

    while 1:
        (buginfo, bodies) = info
        body = bodies[0]

        r = select_options(body, valid, title=buginfo.subject, ui=ui, help=options)
        ui = None
        if not r or (r == 'o'):
            break
        elif r == 'q':
            return -1
        elif r == 'm':
            return buginfo

        launch_browser(debbugs.get_report_url(system, number, archived))
    return


def handle_bts_query(package, bts, timeout, mirrors=None, http_proxy="",
                     queryonly=False, screen=None, title="", archived='no',
                     source=False, version=None, mbox=False, buglist=None,
                     mbox_reader_cmd=None, latest_first=False):
    from reportbug import debbugs

    sysinfo = debbugs.SYSTEMS[bts]
    root = sysinfo.get('btsroot')
    if not root:
        ewrite("%s bug tracking system has no web URL; bypassing query.\n",
               sysinfo['name'])
        return

    ui = screen
    if not ui:
        ui = initialize_urwid_ui()

    if isinstance(package, basestring):
        pkgname = package
        if source:
            pkgname += ' (source)'

        display_message('Querying %s bug tracking system for reports on %s',
                        debbugs.SYSTEMS[bts]['name'], pkgname,
                        ui=ui, title=title)
    else:
        display_message('Querying %s bug tracking system for reports %s',
                        debbugs.SYSTEMS[bts]['name'],
                        ' '.join([str(x) for x in package]), ui=ui, title=title)

    result = None
    try:
        (count, sectitle, hierarchy) = debbugs.get_reports(
            package, timeout, bts, mirrors=mirrors, version=version,
            http_proxy=http_proxy, archived=archived, source=source)
    except Exception, e:
        ui.run_wrapper(nullfunc)
        long_message('Unable to connect to %s BTS.', sysinfo['name'],
                     title=title)
        raise NoBugs

    try:
        if not count:
            ui.run_wrapper(nullfunc)
            if hierarchy is None:
                raise NoPackage
            else:
                raise NoBugs
        else:
            if count > 1:
                sectitle = '%d bug reports found' % (count,)
            else:
                sectitle = '%d bug report found' % (count,)

            buglist = []
            for (t, bugs) in hierarchy:
                bcount = len(bugs)
                buglist.append(('---', t))
                buglist_tmp = {}
                for bug in bugs:
                    # show if the bugs is already resolved
                    done = ''
                    if bug.pending == 'done':
                        done = '  [RESOLVED]'
                    buglist_tmp[bug.bug_num] = bug.subject + done
                # append the sorted list of bugs for this severity
                map(buglist.append, [(str(k), buglist_tmp[k]) for k in sorted(buglist_tmp, reverse=latest_first)])

            p = buglist[1][0]
            # scr.popWindow()
            if queryonly:
                cancellabel = 'Exit'
                quitlabel = None
            else:
                cancellabel = 'New bug'
                quitlabel = 'Quit'

            while True:
                info = menu('Select a bug to read (and possibly report more information) or report a new bug:', buglist,
                            '', ui=ui, title=sectitle, default=p,
                            oklabel='Read bug',
                            cancellabel=cancellabel,
                            quitlabel=quitlabel)
                ui = None
                if info < 0:
                    if info == -1:
                        result = None
                    # -2 is the Quit response, triggers the exiting way in main
                    elif info == -2:
                        raise NoReport
                    else:
                        # uniform to return Bugreport instance
                        result = debbugs.get_report(info, timeout)[0]
                    break
                else:
                    p = info
                    res = show_report(int(p), bts, mirrors, http_proxy,
                                      timeout, queryonly=queryonly)
                    if res:
                        result = res
                        break

    except NoPackage:
        ui.run_wrapper(nullfunc)
        long_message('No record of this package found.', title=title)
        raise NoPackage

    # we didn't find a report; we access Bugreport thru debbugs,
    # so to avoid and import of debianbts
    if result and not isinstance(result, debbugs.debianbts.Bugreport):
        raise NoReport

    return result


palette = [
    ('body', 'black', 'light gray', 'standout'),
    ('border', 'black', 'dark blue'),
    ('shadow', 'white', 'black'),
    ('selectable', 'black', 'dark cyan'),
    ('focus', 'white', 'dark blue', 'bold'),
    ('focustext', 'light gray', 'dark blue'),
    ('title', 'dark red', 'light gray'),
    ('scrolllabel', 'white', 'dark cyan'),
]


def initialize():
    return True


def can_input():
    return sys.stdin.isatty()
